FROM_OSSVOL
l = FROM_OSSVOL((u_int)idat & 0xff);
r = FROM_OSSVOL(((u_int)idat >> 8) & 0xff);
lgain = FROM_OSSVOL((volume >> 0) & 0xff);
rgain = FROM_OSSVOL((volume >> 8) & 0xff);
l = FROM_OSSVOL( idat & 0xff);
r = FROM_OSSVOL((idat >> 8) & 0xff);